For some reason very few people know I have a section on my website that identifies what nozzle was on a pump when it was delivered.
If you click on this address: www.petrocollect.com
you will get to my site.
Go down to the bottom and click on "Please click here..."
You will now find a list of all the things I have on my site, there are over 27,000 images on the site.
Click on "Nozzles"
Click on "Tokheim"
Go down the list to "850 Late....," this is the nozzle you are looking for.
The parts manual you have is for the early version of the 850, the one with the chain drive.
Here is the address for the literature I have for both the early and the late 850: http://petrolianacollectibles.com/tokheim%20850.htm